package com.teach.controller;

import java.awt.image.BufferedImage;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;

/**<pre>
 * 
 * 创建时间 ：	2019年12月4日 上午10:00:53
 * 当前版本：	V1.0
 * Copyright © 1998 - 2019 jlzhou.top. All Rights Reserved	
 * </pre>
 * @author J.L.Zhou
 *
 */
@Controller
@RequestMapping("/")
public class CodeController {

	@Autowired
	private Producer captchaProducer;
	

	  @RequestMapping("code.do") 
	  public ModelAndView getKaptchaImage(HttpServletRequest request, HttpServletResponse response) throws Exception {  
	      HttpSession session = request.getSession();  

	      //禁止浏览器缓存
	      response.setDateHeader("Expires", 0);  
	      response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");  
	      response.addHeader("Cache-Control", "post-check=0, pre-check=0");  
	      response.setHeader("Pragma", "no-cache");  
	        
	      // return a jpeg  
	      response.setContentType("image/jpeg");  
	        
	      String capText = captchaProducer.createText();
	        
	      session.setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);  
	        
	      BufferedImage bi = captchaProducer.createImage(capText);  
	      ServletOutputStream out = response.getOutputStream();  
	        
	      // write the data out  
	      ImageIO.write(bi, "jpg", out);  
	      try {
	          out.flush();  
	      } finally {  
	          out.close();  
	      }  
	      return null;  
	  }  

}
